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Ulmus parvifolia

Species of tree From Wikipedia, the free encyclopedia

Ulmus parvifolia

Ulmus parvifolia, commonly known as the Chinese elm[2] or lacebark elm, is a species native to eastern Asia, including China, India, Japan, Korea, Vietnam,[3] Siberia and Kazakhstan.[4] It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus".[5]

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Chinese elm as bonsai during spring growing season.

Quick Facts Conservation status, Scientific classification ...
Ulmus parvifolia
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Chinese elm, Hilversum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Ulmaceae
Genus: Ulmus
Subgenus: U. subg. Ulmus
Section: U. sect. Microptelea
Species:
U. parvifolia
Binomial name
Ulmus parvifolia
Synonyms
  • Microptelea parvifolia Spach
  • Planera parvifolia Sweet
  • Ulmus campestris var. chinensis Loudon
  • Ulmus chinensis Persoon
  • Ulmus parvifolia Maxim., Franch. et Savatier, Forbes & Hemsl., Shirasawa
  • Ulmus sieboldii Daveau
  • Ulmus virgata Roxburgh
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Description

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A small to medium deciduous or semideciduous (rarely semievergreen) tree, it grows to 10–18 m (33–59 ft) tall and 15–20 m (49–66 ft) wide with a slender trunk and crown. The leathery, lustrous green, single-toothed leaves are small, 2–5 cm long by 1–3 cm broad,[6] and often retained as late as December or even January in Europe and North America. In some years the leaves take on a purplish-red autumn colour.[7] The apetalous wind-pollinated perfect flowers are produced in early autumn, small and inconspicuous. The fruit is a samara, elliptical to ovate-elliptical, 10–13 mm long by 6–8 mm broad.[3] The samara is mostly glabrous, the seed at the centre or toward the apex, is borne on a stalk 1–3 mm in length; it matures rapidly and disperses by late autumn. The trunk has a handsome, flaking bark of mottled greys with tans and reds, giving rise to its other common name, the lacebark elm, although scarring from major branch loss can lead to large, canker-like wounds. Ploidy: 2n = 28.[8][9][10][11][12]

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    Young U. parvifolia in new leaf, May
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    New leaves
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    Foliage and immature fruit
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    Foliage and mature fruit
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    Bark
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    Habit of older tree
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    U. parvifolia juvenile
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    U. parvifolia autumn colouring, Japan

Many nurserymen and foresters mistakenly refer to Ulmus pumila, the rapidly growing, disease-ridden, relatively short-lived, weak-wooded Siberian elm, as "Chinese elm". This has given the true Chinese elm an undeserved bad reputation. The two elms are distinct species. The Siberian elm's bark becomes deeply ridged and furrowed with age, among other obvious differences. It possesses a very rough, greyish-black appearance, while the Chinese elm's smooth bark becomes flaky and blotchy, exposing distinctive, light-coloured mottling: hence the synonym lacebark elm for the real Chinese elm. Siberian elm produces seed in spring, Chinese elm in autumn.[13]

Wood and timber

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Elms, hickory, and ash all have remarkably hard, tough wood, making them popular for tool handles, bows, and baseball bats. Chinese elm is considered the hardest of the elms. Chinese elm is said to be the best of all woods for chisel handles and similar uses due to its superior hardness, toughness, and resistance to splitting. Chinese elm lumber is used most for furniture, cabinets, veneer, hardwood flooring, and specialty uses such as longbow construction and tool handles. Most commercially milled lumber goes directly to manufacturers rather than to retail lumber outlets.[citation needed]

Chinese elm heartwood ranges in tone from reddish-brown to light tan, while the sapwood approaches off-white. The grain is often handsome and dramatic. Unlike other elms, the freshly cut Chinese elm has a peppery or spicy odour. While it turns easily and will take a nice polish off the lathe without any finish, and it holds detail well, the fibrous wood is usually considered too tough for carving or hand tools. Chinese elm contains silica which is hard on planer knives and chainsaws, but it sands fairly easily. Like other woods with interlocking grain, planes should be kept extra sharp to prevent tearing at the grain margins. It steam-bends easily and holds screws well, but pilot holes and countersinking are needed. It tends to be a "lively" wood, tending to warp and distort while drying. This water-resistant wood easily takes most finishes and stains.[citation needed]

Taxonomy

Subspecies, varieties, and forms:

Pests and diseases

The Chinese elm is highly resistant, but not immune, to Dutch elm disease. It is also very resistant to the elm leaf beetle Xanthogaleruca luteola, but has a moderate susceptibility to elm yellows.[14] In trials at the Sunshine Nursery, Oklahoma, the species was adjudged as having the best pest resistance of about 200 taxa [15] However, foliage was regarded as only "somewhat resistant" to black spot by the Plant Diagnostic Clinic of the University of Missouri.[16]

Cottony cushion scale or mealy bugs, often protected and "herded" by ants, exude sticky, sweet honeydew, which can mildew leaves and be a minor annoyance by dripping on cars and furniture. However, severe infestations on or obvious damage to otherwise healthy trees are uncommon.[citation needed]

In some regions of the Southern United States, a fungus known as Phymatotrichopsis omnivora is known to cause sudden death of lacebark elms when infected.[citation needed] Alan Mitchell reported (1984) that established trees at Kew Gardens and at Royal Victoria Park, Bath, had been killed by honey fungus.[17]

Cultivation

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The Chinese elm is a tough landscape tree, hardy enough for use in harsh planting situations such as parking lots, small planters along streets, and plazas or patios. The tree is arguably the most ubiquitous elm, now found on all continents except Antarctica. It was introduced to Europe at the end of the 18th century as an ornamental and is found in many botanical gardens and arboreta.[18][19] The tree was introduced to the UK in 1794 by James Main, who collected in China for Gilbert Slater of Low Layton, Essex.[20][8] It was also introduced to the United States in 1794,[21] where, before the introduction of cold-hardy forms from the 1990s, it was mainly planted in southern States and in California.[22] It has proved very popular in recent years as a replacement for American elms killed by Dutch elm disease. The tree was distributed in Victoria, Australia, from 1857.[23] At the beginning of the 20th century, Searl's Garden Emporium, in Sydney, marketed it.[citation needed] Three U. parvifolia were supplied in 1902 by Späth to the Royal Botanic Garden Edinburgh.[24][25] In New Zealand, it was found to be particularly suitable for windswept locations along the coast. The tree is commonly planted as an ornamental in Japan,[26] notably around Osaka Castle.

Ulmus parvifolia is one of the cold-hardiest of the Chinese species. In artificial freezing tests at the Morton Arboretum.[27] the LT50 (temp. at which 50% of tissues die) was found to be −34 °C (−29 °F).

Bonsai

Owing to its versatility and ability to tolerate a wide range of temperatures, light, and humidity conditions, the Chinese elm is a popular choice as a bonsai species. It is perhaps the single most widely available. It is considered a good choice for beginners because of its high tolerance of pruning.[28]

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    U. parvifolia bonsai, multitrunk style, about 100 years old
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    Chinese elm bonsai
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    Chinese elm bonsai
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    Chinese elm bonsai

Cultivars

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Numerous cultivars have been raised, mostly in North America:

Of these, the following are non-dwarf, non-bonsai cultivars:

Hybrid cultivars

Ulmus parvifolia is an autumn-flowering species, whereas most other elms flower in the spring. Hybrids include:[29][30]

Naturalisation

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Naturalised U. parvifolia establishing itself by a roadside, Greensboro, North Carolina (2022)

U. parvifolia has become naturalised in various parts of the US, including Idaho, Oklahoma, West Virginia, and Kentucky.[31][32][33] It is listed as invasive in District of Columbia, North Carolina, Nebraska, New Jersey, Virginia, and Wisconsin.[34][35] As a "garden escape" it has also become naturalised in South Africa, where in 1904 it was described as "common near Irene",[36] and in 1980 as "occasional" in Moreleta Park, both near Pretoria.[37]

Notable trees

The tree in Central Park, New York, planted in 1865 by James Hogg,[38][20] from which the cultivar Central Park Splendor was cloned, was believed to be the oldest specimen of lacebark elm in the US at the time of its death in the 1990s, with a diameter at breast height of 1.4 m.[22]

Etymology

The name "lacebark elm", referring to the distinctive patchwork bark patterns, was suggested by E. W. Johnson of the Woodward, Oklahoma, USDA research station (who received U. parvifolia seed sent from the Far East by collector Frank Meyer c.1908), in order to reduce confusion with the Siberian elm, U. pumila, also called 'Chinese elm' in the early days. Carl E. Whitcomb of Oklahoma State University, who raised the cultivar 'Prairie Shade', reintroduced the name "lacebark elm" in his Know It and Grow It: A guide to the identification and use of landscape plants (1975).[4]

Accessions

North America
Europe
Australasia

References

External links

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